Regarding the Software Failure: Mid-air collisions were avoided in the 2004 LA Air Traffic Control incident due to the on-board collision avoidance systems now found on commercial jets.

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Although collisions were avoided in part due to the quick thinking of some controllers who used their cell phones to alert other traffic-control centers and the airlines, it was mostly the on-board collision avoidance systems that alerted pilots to climb or descend at the last minute to avoid collisions.
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Regarding the Software Failure: Mid-Air Collisions Were Avoided in the 2004